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<pre class="textdiagram" id="fig17">
                 +-----------+
                 |           |
                 | Publisher |
                 |           |
                 +-----------+
                 |    PUB    |
                 \-----------/
                     bind
           tcp://192.168.55.210:5556
                       |
                       |
      +----------------+----------------+
      |                |                |
      |                |                |
   connect           connect            |
/------------\   /------------\       connect
|    SUB     |   |    SUB     |   /------------\
+------------+   +------------+   |    SUB     |
|            |   |            |   +------------+
| Subscriber |   | Subscriber |   |            |
|            |   |            |   | Forwarder  |
+------------+   +------------+   |            |
                                  +------------+
 Internal network                 |    PUB     |
 ---------------------------------\------------/--------
 External network                      bind
                                tcp://10.1.1.0:8100
                                        |
                                        |
                               +--------+--------+
                               |                 |
                               |                 |
                            connect           connect
                         /------------\    /------------\
                         |    SUB     |    |    SUB     |
                         +------------+    +------------+
                         |            |    |            |
                         | Subscriber |    | Subscriber |
                         |            |    |            |
                         +------------+    +------------+
</pre>
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